Which Diet is Best?

With so many diets promising fast and effortless results, it can be difficult to understand why some approaches seem to work while others do not. From keto and intermittent fasting to paleo, vegan, and low-carb diets, each plan often claims to have a unique advantage. While these diets differ in the foods they emphasize or restrict, they all share one common factor: they help create a calorie deficit.

Understanding this concept can help take the confusion out of weight loss and allow you to focus on strategies that are sustainable for the long term. For far too long in my own weight loss journey, I thought there was some secret shortcut I could take to lose the weight and keep it off, when all I needed was balance and portion control!

The Real Driver of Change: A Caloric Deficit

A calorie deficit occurs when you consume fewer calories than your body uses. Your body requires energy every day to support essential functions such as breathing, digestion, circulation, movement, and physical activity. When you consistently eat fewer calories than your body needs, it must draw upon stored energy (primarily body fat) to make up the difference.

This is the fundamental reason any diet can lead to weight loss. Regardless of whether a person follows a low-carb diet, counts Weight-Watcher points, avoids eating after a certain time, or eliminates specific food groups, weight loss occurs because overall calorie intake has decreased relative to energy expenditure.

While hormones, food quality, sleep, stress, and activity levels can influence appetite, energy levels, and body composition, the underlying mechanism of fat loss remains the same: maintaining a calorie deficit over time.

But - Why Do Different Diets Seem to Work for Some People?

Many popular diets work because they create structure around eating, making it easier for some individuals to consume fewer calories without intentionally counting them. Such as:

Low-Carb Diets: Low-carb diets often eliminate foods such as bread, pasta, rice, sweets, and sugary beverages. By removing many calorie-dense foods, people may naturally reduce their overall calorie intake. Plus, cutting carbs automatically results in higher protein and fat intakes, which is often associated with increase feelings of fullness and therefore reduced caloric intake.

Intermittent fasting: Intermittent fasting focuses on when you eat rather than what you eat. By limiting the eating window, many people end up consuming fewer calories throughout the day simply because they have fewer opportunities to eat.

Paleo Diets: Paleo diets emphasize whole foods such as meat, fish, fruits, vegetables, nuts, and seeds while eliminating processed foods and many packaged snacks. This can reduce calorie intake by encouraging foods that are often more filling and nutrient-dense. This diet may seem great and is very similar to what many Dieticians recommend as a healthy lifestyle, but its also important to practice moderation with all foods and remove the morality surrounding them. Fostering a fear-driven food environment can be dangerously close to disordered habits, and likely isn’t going to be sustainable in the long run. 

Plant-Based Diets: Plant-based diets often include higher amounts of fruits, vegetables, legumes, and whole grains. These foods tend to be rich in fibre and water, which can help increase fullness while reducing overall calorie intake.

Although these diets may appear very different, they often produce similar results because they help individuals consume fewer calories in a way that feels manageable for them.

The Problem with Restrictive Dieting

While many diets can lead to weight loss initially, not all diets are easy to maintain. Restrictive eating patterns can create challenges that make long-term success difficult.

Eliminating entire food groups or labeling foods as "good" or "bad" may increase cravings and make eating feel stressful. Many people find that strict rules are manageable for a few weeks or months but become increasingly difficult to follow over time.

When a diet is overly restrictive, feelings of deprivation can develop. This may lead to cycles of strict dieting followed by overeating, making it harder to maintain progress or even resulting in weight regain past your original weight.

Research consistently shows that long-term adherence is one of the strongest predictors of successful weight management. In other words, the best diet is not necessarily the one that produces the fastest results, it's the one you can realistically maintain.

Why Moderation Often Works Best

Rather than eliminating foods you enjoy, a more sustainable approach is learning how to include them in appropriate portions within a balanced eating pattern.

Moderation allows flexibility and makes room for both nutritious foods and fun foods that bring enjoyment. This approach can help reduce feelings of restriction while supporting long-term consistency.

For example, enjoying a slice of pizza, a scoop of ice cream, or a favourite dessert does not automatically prevent weight loss. What matters most is your overall eating pattern and energy balance over time.

When people know they can still enjoy their favourite foods occasionally, they are often less likely to experience intense cravings or feelings of guilt around eating.

Building a Sustainable Weight Loss Approach

A sustainable weight loss plan does not require cutting out carbohydrates, avoiding social events, or following complicated food rules. Instead, it focuses on habits that can be maintained for months and years.

Example strategies to help create a calorie deficit without making eating feel restrictive or overwhelming include:

- Eating regular meals that contain protein, fibre, and healthy fats

- Including plenty of fruits and vegetables

- Choosing mostly minimally processed foods while still allowing flexibility

- Practicing portion awareness instead of strict food avoidance

- Staying physically active

- Prioritizing sleep and stress management

- Allowing room for favourite foods in moderation